Oxide of cobalt, 1 part; oxide of zinc, 3 or 4 parts; flux No. 3, 6 parts; melt and pour out. If it is not sufficiently green, increase the zinc and flux. 231. AZURE BLUE Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 8 parts; melt them together. 232. DEEP AZURE BLUE Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 5 parts. The beauty of this colour depends on the proportion of flux. As little as possible is to be used; it must, however, be brilliant. Sometimes less is used than the proportion indicated. 233. SKY BLUE Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 12 parts; pound up, melt, and pour out. 234. EMERALD GREEN Oxide of copper, 1 part; antimonic acid, 10 parts; flux No. 1, 30 parts; pulverize together, and melt. 235. BLUEISH GREEN Green oxide of chromium, 1 part; oxide of cobalt, 2 parts; triturate, and melt at a high heat. The product is a button slightly melted, from which is removed the portion in contact with the crucible. This button is pounded up, and three parts of flux No. 3, for one of the button, are added to it. 236. GRASS GREEN Green oxide of chromium 1 part, flux No. 3, 3 parts, triturate and melt. 237. DEEP YELLOW Antimonic acid 2 parts, subsulphate of iron 1 part, flux No. 1, 10 parts; melt and pour out. The subsulphate of iron may be increased a little, the proportions of flux vary. 238. JONQUILLE YELLOW FOR FLOWERS Litharge 18 parts, sand 6 parts. The product of the calcination of equal parts of lead and tin 2 parts, carbonate of soda 1 part, antimonic acid 1 part, rub together, or triturate, and melt. 239. WAX YELLOW Litharge 18 parts, sand 4 parts, oxide of antimony 2 parts, sienna earth 2 parts; melt. If it is too deep the proportion of sienna earth may be decreased. 240. ORANGE YELLOW Chromate of lead 1 part, minium 3 parts. 241. BRICK RED Yellow No. 240, 12 parts; red oxide of iron, 1 part. 242. DEEP BLOOD RED Subsulphate of iron, calcined in a muffle until it becomes a beautiful capucine red, 1 part; flux No. 2, 3 parts; mix without melting. 243. BROWN YELLOW OCHRE Yellow ochre No. 244, 10 parts; sienna earth, 1 part; triturate without melting. 244. DEEP YELLOW OCHRE--CALLED YELLOW BROWN Subsulphate of iron, 1 part; oxide of zinc, 1 part; flux No. 2, 5 parts; triturate without melting. 245. PURE PURPLE The purple powder of Cassius mixed while moist with flux No. 3, and sometimes a little chloride of silver previously melted with flux No. 3. If the purple, when prepared, does not melt sufficiently easy, some flux may be added when it is dry. 246. DEEP VIOLET The purple of Cassius, in place of flux No. 3, flux No. 1 is mixed with it. Sometimes a little of blue No. 233 is added. 247. FLESH RED